Pruitt had been scheduled to arrive in Israel on Sunday and planned to learn about the country’s sustainability efforts in Jerusalem and the port city of Haifa, according to the Post. But EPA spokeswoman Liz Bowman told HuffPost that the trip had been called off.

“We decided to postpone; the administrator looks forward to going in the future,” Bowman said in an email. She did not comment on why the trip was canceled.

EPA receipts obtained by the Environmental Integrity Project through Freedom of Information Act requests showed Pruitt and his staffers racked up at least $90,000 worth of taxpayer-funded travel expenses in early June alone.

The EPA’s Office of Criminal Enforcement told Politico that Pruitt’s security team recommended he book first or business class to avoid confrontations with his critics at airports or on airplanes.

“The team leader felt that he was being placed in a situation where he was unsafe on the flight,” Henry Barnet, the office’s director, told Politico. “He was approached in the airport numerous times, to the point of profanities being yelled at him and so forth.”

Pruitt is currently under investigation by the EPA’s inspector general for his use of military and private flights after the Post reported last September that the administrator took four such flights costing taxpayers more than $58,000. The internal agency probe is also looking into Pruitt’s frequent trips to his home state of Oklahoma.